吡咯, 噻酚和呋喃的情况就是这样.Such is the case in pyrrole, thiophene, and furan.研究结果表明关键步骤为原料 4- 甲基 -2, 3- 呋喃二酮的合成.It'shows that the key step is the synthesis of 4 - methyl - dihydro - furan - 2 , 3 - dione.用糠醇和糠醛缩聚制备了新型呋喃树脂.A n...
她是个颇有直觉力的人.She is a very intuitive person.女子比男子的直觉力更强 吗 ?Are women more intuitive than men?我们公司得益于有直觉力的员工团队.Our company profits from the team of intuitive employees we have....
The reaction conditions on oxidation of 2 - methylpyridine to 2 - acid by oxidation of potassium dichromate were studied.研究了以2-甲基吡啶为原料,以重铬酸钾为氧化剂,利用化学氧化法合成 2- 吡啶甲酸的反应条件....